Hello Kin I am completely blocked on it. Please do let me know if I need try out something 🙏 1. I want to stream the video 2. Control camera settings 3. Send commands 4. Transfer files
Will be thankful to your kind input. Regards Anand On Tue, 17 Sept, 2024, 8:10 am Anand Walvekar, < anand.walve...@onemorehustle.com> wrote: > Hello Kin > Could you please guide me on what you did? > > Thanks > Anand > > On Tue, 17 Sept, 2024, 8:00 am Kin, <geniusw...@qq.com> wrote: > >> I can do it without libgphoto. Compiling libgphoto on an iPad or iOS is >> impossible. I tried, but it failed. So, I found an alternative solution. >> >> ------------------ Original ------------------ >> *From:* Anand Walvekar <anand.walve...@onemorehustle.com> >> *Date:* Tue,Sep 17,2024 9:41 AM >> *To:* Ole Aamot <o...@gnu.org> >> *Cc:* gphoto-devel <gphoto-devel@lists.sourceforge.net>, Marcus Meissner >> <mar...@jet.franken.de> >> *Subject:* Re: [gphoto-devel] iPad USB Support >> >> Thank you. libgphoto2 depends on other dylb. Compilation seems to be a >> task >> >> Regards >> Anand >> >> On Tue, 17 Sept, 2024, 6:18 am Ole Aamot, <o...@gnu.org> wrote: >> >>> Implement libgphoto2 Camera Driver for iPad USB >>> >>> Implementing a camera driver using `libgphoto2` and `libusb` for iPadOS >>> is complex, particularly due to iOS's restrictions on direct USB access. >>> However, I can guide you through writing code that integrates `libgphoto2` >>> and `libusb` in a general way, while recognizing the unique hurdles on >>> iPadOS. >>> >>> Here’s an example that assumes you're able to compile `libusb` and >>> `libgphoto2` for iOS. This example sets up a simple app that uses a camera >>> connected via USB. Keep in mind that on iPad, actual USB access will likely >>> be limited unless you have the proper entitlements from Apple. >>> >>> ### 1. **Cross-Compiling `libgphoto2` and `libusb`** >>> >>> First, you need to cross-compile `libgphoto2` and `libusb` for iPad. >>> This process involves setting up a toolchain and using CMake to build the >>> libraries as static libraries for ARM architecture. Here’s a guide for that >>> process: >>> >>> ```bash >>> # Install dependencies (on macOS) >>> brew install automake libtool cmake >>> >>> # Clone libgphoto2 >>> git clone https://github.com/gphoto/libgphoto2.git >>> cd libgphoto2 >>> >>> # Build for iOS (ensure you have an iOS toolchain configured) >>> ./autogen.sh >>> ./configure --host=arm-apple-darwin >>> make >>> ``` >>> >>> ### 2. **Basic iOS App Setup (Swift + Objective-C)** >>> >>> In Xcode, create a new iOS project in Swift, then add the compiled >>> static libraries for `libgphoto2` and `libusb`. >>> >>> ### 3. **Bridging Header for `libgphoto2` in Swift** >>> >>> Since `libgphoto2` is a C library, you will need to create a bridging >>> header to use it within a Swift-based iOS project. >>> >>> **Create `gphoto2_bridge.h` (Objective-C bridging header):** >>> >>> ```objective-c >>> // gphoto2_bridge.h >>> #import <Foundation/Foundation.h> >>> >>> #ifdef __cplusplus >>> extern "C" { >>> #endif >>> >>> #include <gphoto2/gphoto2.h> >>> >>> int detect_camera(GPContext *context); >>> >>> #ifdef __cplusplus >>> } >>> #endif >>> ``` >>> >>> **Create `gphoto2_bridge.c` (C code that interacts with libgphoto2):** >>> >>> ```c >>> #include "gphoto2_bridge.h" >>> >>> int detect_camera(GPContext *context) { >>> int ret; >>> Camera *camera; >>> GPPortInfoList *portinfolist = NULL; >>> CameraAbilitiesList *abilities = NULL; >>> >>> ret = gp_camera_new(&camera); >>> if (ret < GP_OK) return ret; >>> >>> ret = gp_abilities_list_new(&abilities); >>> if (ret < GP_OK) return ret; >>> >>> ret = gp_port_info_list_new(&portinfolist); >>> if (ret < GP_OK) return ret; >>> >>> ret = gp_abilities_list_load(abilities, context); >>> if (ret < GP_OK) return ret; >>> >>> ret = gp_port_info_list_load(portinfolist); >>> if (ret < GP_OK) return ret; >>> >>> return GP_OK; >>> } >>> ``` >>> >>> ### 4. **Swift Code (ViewController.swift)** >>> >>> This Swift code will interact with the `libgphoto2` library via the >>> bridging header. >>> >>> ```swift >>> import UIKit >>> >>> class ViewController: UIViewController { >>> >>> override func viewDidLoad() { >>> super.viewDidLoad() >>> >>> // Call the C function to detect the camera >>> detectCamera() >>> } >>> >>> func detectCamera() { >>> // Create the GPContext >>> let context = createGPContext() >>> >>> // Call the detect_camera function from the C library >>> let result = detect_camera(context) >>> if result == 0 { >>> print("Camera detected successfully!") >>> } else { >>> print("Failed to detect camera.") >>> } >>> } >>> >>> // GPContext is a placeholder for actual libgphoto2 context >>> management >>> func createGPContext() -> OpaquePointer? { >>> let context: OpaquePointer? = nil >>> // You'd need to properly initialize the context here >>> return context >>> } >>> } >>> ``` >>> >>> ### 5. **Handling USB Access (libusb)** >>> >>> You would similarly add a bridging header and interact with `libusb`. >>> However, due to iOS restrictions, `libusb` is likely to require >>> entitlements to access USB devices directly. >>> >>> **Create `usb_bridge.h` (bridging header for libusb):** >>> >>> ```objective-c >>> #import <Foundation/Foundation.h> >>> >>> #ifdef __cplusplus >>> extern "C" { >>> #endif >>> >>> #include <libusb-1.0/libusb.h> >>> >>> int initialize_usb(); >>> >>> #ifdef __cplusplus >>> } >>> #endif >>> ``` >>> >>> **Create `usb_bridge.c`:** >>> >>> ```c >>> #include "usb_bridge.h" >>> >>> int initialize_usb() { >>> libusb_context *ctx = NULL; >>> int r = libusb_init(&ctx); >>> if (r < 0) { >>> return r; >>> } >>> >>> // Find connected USB devices >>> libusb_device **devs; >>> ssize_t cnt = libusb_get_device_list(ctx, &devs); >>> if (cnt < 0) return (int)cnt; >>> >>> libusb_free_device_list(devs, 1); >>> libusb_exit(ctx); >>> return 0; >>> } >>> ``` >>> >>> ### 6. **Swift Code for USB Initialization** >>> >>> ```swift >>> func initializeUSB() { >>> let result = initialize_usb() >>> if result == 0 { >>> print("USB initialized successfully.") >>> } else { >>> print("Failed to initialize USB.") >>> } >>> } >>> ``` >>> >>> ### 7. **Handle iOS Permissions and Testing** >>> >>> Given iOS’s restrictions on USB access, you’ll need to consider using >>> Apple’s `ExternalAccessory` framework for official USB hardware access. >>> Alternatively, if the camera supports wireless (e.g., Wi-Fi), you can >>> communicate over the network to avoid USB restrictions altogether. >>> >>> Testing on an actual device will be critical because the iOS Simulator >>> does not support USB or accessory connections. >>> >>> ### 8. **Next Steps and Entitlements** >>> >>> - **Request Entitlements**: To access USB devices, you will likely need >>> to join Apple's MFi (Made for iPhone/iPad) program and request the >>> necessary entitlements. >>> - **Test and Debug**: Testing on actual hardware will help you >>> understand how the app behaves when communicating with a camera via USB. >>> >>> Would you like assistance with any specific part of the code, or do you >>> need further guidance on handling USB in iOS? >>> >>> Sincerely, >>> >>> >>> Ole Aamot >>> >>> o...@aamot.org >>> >>> www.aamot.org >>> >>> +47-4173-2002 >>> >>> >>> >>> On Mon, Sep 16, 2024 at 7:28 AM Anand Walvekar < >>> anand.walve...@onemorehustle.com> wrote: >>> >>>> Thank you Ole for your time. >>>> >>>> ChatGPT seems to be more descriptive to you 😊 >>>> >>>> I have been trying to recompile the libgphoto2 and its dependencies >>>> with clang and linking with iOS framework. Clang treats warning as errors >>>> and it needs source code changes. Also libgphoto2 loads dylb from system >>>> path which also needs to be taken into account. >>>> >>>> Over it's not straightforward. >>>> >>>> Thank you >>>> Anand >>>> >>>> >>>> >>>> On Mon, 16 Sept, 2024, 3:37 am Ole Aamot, <o...@gnu.org> wrote: >>>> >>>>> ChatGPT gave this answer: >>>>> >>>>> To implement a **libgphoto2** camera driver for an iPad over USB, you >>>>> would need to address several layers of challenges including hardware >>>>> support, communication protocols, and OS-level restrictions. Here's a >>>>> high-level approach to guide the development: >>>>> >>>>> ### Steps to Implement libgphoto2 Camera Driver for iPad USB >>>>> >>>>> #### 1. **Understand the iPad USB Accessory Framework** >>>>> - Apple provides the **External Accessory framework** to >>>>> communicate with external hardware. However, it's quite restrictive and >>>>> typically meant for licensed manufacturers. >>>>> - iOS and iPadOS don't natively support generic USB drivers like on >>>>> Linux or Windows, so the challenge is creating a bridge for libgphoto2 to >>>>> access the camera hardware over USB. >>>>> - Check if the camera can be accessed via a **Camera Connection >>>>> Kit** or Lightning-to-USB adapter and whether it's recognized as a USB >>>>> accessory. >>>>> >>>>> #### 2. **Develop a Custom iOS App** >>>>> - You would likely need to create a custom iOS application using >>>>> **Swift** or **Objective-C** to interface with the camera. >>>>> - Investigate the **USBDevice** API (for iOS 16+) if available, >>>>> which offers more flexibility in accessing USB devices directly on >>>>> iOS/iPadOS. >>>>> - Use the **USB Accessory Mode** for detecting connected devices. >>>>> >>>>> #### 3. **Compile libgphoto2 for iOS** >>>>> - Libgphoto2 is built for POSIX systems, so you’ll need to >>>>> cross-compile it for iOS using tools like **Xcode** or **CMake** with >>>>> specific target flags for ARM architecture. >>>>> - It may require modifications to libgphoto2 code to interact with >>>>> iOS's unique environment and APIs. >>>>> - Remove or adapt dependencies in libgphoto2 that might not be >>>>> supported by iOS (such as certain POSIX libraries). >>>>> >>>>> #### 4. **USB Communication Bridge** >>>>> - Libgphoto2 communicates with cameras using PTP (Picture Transfer >>>>> Protocol) or proprietary protocols over USB. >>>>> - Implement a communication bridge between libgphoto2 and iOS's USB >>>>> interface. This may involve writing code to mimic Linux's USB driver >>>>> behavior within the iOS app. >>>>> - The **libusb** library might also need to be ported or modified >>>>> for iOS to enable USB communication, since it is widely used by >>>>> libgphoto2. >>>>> >>>>> #### 5. **Sandboxing and Permissions** >>>>> - iOS has strict sandboxing. Ensure that your app requests the >>>>> necessary permissions to communicate with USB devices and interact with >>>>> external hardware. >>>>> - Add necessary entitlements in the **Info.plist** file, like >>>>> `com.apple.external-accessory` or `com.apple.developer.usb`. >>>>> >>>>> #### 6. **Testing with Different Cameras** >>>>> - Libgphoto2 supports a wide range of cameras, so you'll need to >>>>> test with specific camera models. >>>>> - Ensure that the camera can be recognized by the app, and you can >>>>> trigger functions like capturing images, downloading files, or controlling >>>>> camera settings. >>>>> >>>>> #### 7. **Distributing the App** >>>>> - If the app is for personal use, you can sideload it to your iPad >>>>> using Xcode and a developer account. >>>>> - If the goal is broader distribution, you would need to ensure >>>>> compliance with Apple's guidelines, especially for apps interacting with >>>>> external hardware. >>>>> >>>>> ### Challenges >>>>> - **Apple's closed ecosystem**: iOS is not designed to be an open >>>>> system like Linux, so you will face challenges accessing hardware. >>>>> - **Licensing**: If this driver is to be distributed, you may need >>>>> Apple's MFi (Made for iPhone/iPad) certification for USB accessory >>>>> communication. >>>>> >>>>> ### Summary >>>>> This task involves cross-compiling libgphoto2 for iOS, interfacing >>>>> with iPad USB APIs, and overcoming OS-level restrictions. Starting with >>>>> Apple’s USBDevice APIs and building a custom iOS app to bridge >>>>> libgphoto2’s >>>>> functionality is the best approach. You will likely need to experiment >>>>> with >>>>> lower-level hardware protocols and iOS permissions to make it work >>>>> effectively. >>>>> >>>>> Sincerely, >>>>> >>>>> >>>>> Ole Aamot >>>>> >>>>> o...@aamot.org >>>>> >>>>> www.aamot.org >>>>> >>>>> +47-4173-2002 >>>>> >>>>> >>>>> >>>>> On Tue, Sep 10, 2024 at 9:11 AM Marcus Meissner <mar...@jet.franken.de> >>>>> wrote: >>>>> >>>>>> Hi, >>>>>> >>>>>> On Sun, Sep 08, 2024 at 07:21:03PM +0530, Anand Walvekar wrote: >>>>>> > Hi Team >>>>>> > Hope you are doing well. >>>>>> > >>>>>> > I need your help to integrate libgphoto2 in iPad application. Could >>>>>> you >>>>>> > please share me few links which I can try it out. >>>>>> > >>>>>> > Thank you >>>>>> > Anand >>>>>> >>>>>> This likely means the iPad as USB Host for cameras? >>>>>> >>>>>> I am not familar with either iPad or if iPad USB-Host is even >>>>>> possible, >>>>>> perhaps someone else knows it :/ >>>>>> >>>>>> Ciao, Marcus >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Gphoto-devel mailing list >>>>>> Gphoto-devel@lists.sourceforge.net >>>>>> https://lists.sourceforge.net/lists/listinfo/gphoto-devel >>>>>> >>>>>
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